It was made much better by using fresh basil and adding Balsamic and onions like many others have suggested. Next time, I might try green onions. I also cut out the parmesan and sprinkled a little mozarella on top - I loved it that way.

This was very creamy! Next time, I might add a tiny bit of vanilla bean instead of extract. All around good recipe, though. The use of half and half makes it much richer than most milkshake recipes I've tried so far.